[SYCL][test] Fix sycl-offload-jit.cpp CHK-SPLIT tests for sycl-web (#22529)
Tests added via 87a09a0ff00c were written for upstream 'main' defaults
where -fsycl implicitly uses the new offloading driver and spirv64 as
the default SYCL triple. In sycl-web, the new driver requires
--offload-new-driver explicitly, and the default SYCL triple is
spir64-unknown-unknown.
Add --offload-new-driver to CHK-SPLIT-* RUN lines and update expected
triple from spirv64 to spir64.
CMPLRLLVM-76596
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>